Universal Chevy LS Swap headers. Polished stainless steel. These fit 4.8L, 5.3L, 5.7L(Ls1), 6.0L & 6.2L GM LS style engines. (Gen 3 and Gen 4 Ls Motors) They will fit most LS swap applications including: Square body pickups C10 C20 C30 K10 K20 K30 Previous body style pickups (Action Series / CST Series) C10 C20 C30 K10 K20 K30 K5 Blazer & Jimmy Suburban 73-91 OBS C1500 Silverado Sierra S10 Pickups With modifications or customization of the Y pipe, they will also fit newer style Chevy and GMC trucks, Tahoe, Yukon and Suburban; 2500 and 3500 pickup that were originally equipped with LS style engines but THIS IS NOT RECOMENDED UNLESS YOU ARE READY TO REWORK THE Y PIPE. THEY WILL NOT BOLT UP TO THE EXISTING Y PIPE on these vehicles, so modification is required. These headers are intended for swaps and not for factory applications that came stock with LS style engines.